In what situations cannot double-acting pneumatic valves be used?

Double-acting pneumatic valves are not suitable for the following situations: 1. Emergency situations where rapid shutdown of the fluid is required to prevent accidents. 2. Environments with unstable air supply or insufficient pressure. 3. Areas with explosive or flammable gases and extreme high-temperature environments. 4. Precision control systems with extremely high requirements for valve response time. 5. Areas with limited energy supply that cannot ensure continuous gas supply. .

It can’t be used in FC/FO scenarios.

Double-acting actuators can also be used in FC/FO applications, but air tanks, lock valves, and similar components must be installed

A pressure retention valve (lockout valve) is a device that detects pressure in a timely manner when the air supply pressure falls below the set value, and can automatically shut off the flow path. When the compressed air supply fails and stops delivering air, a gas lock valve is used to shut off the valve control channel, keeping the valve in its position before the air supply was interrupted. To ensure the normal progress of the process, the hold valve opens the passage only after the accident in the system has been resolved and gas supply is restored, thereby resuming normal control. The function of the hold valve here is different from the principle mentioned above. The function of the hold valve here is as follows: when there is a fault in the air supply, the hold valve loses control over the air flow. It causes the air-controlled valves A and B to operate simultaneously; the gas on one side of the cylinder is released through valve A, while the gas from the air reservoir enters the other side of the cylinder through valve B. By opening or closing these valves, the FO/FC function is achieved.